Duplicating apparatus



'Sept. 27, 1938. A. MARCH EV DUPLICAT-ING APPARATUS Filed March 29, 1937 4' Sheets-Sheet I:

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A. MARCHEV DUPLICATING APPARATUS Sept. 27, 1938.

Filed March 29, 1937 4 Sheets-Sheet 2 Sept. 27, 1938.

A. MARCHEV DUPLICATING APPARATUS Fiied March 29, 1937 4 Sheets-Sheet s g &m

Sept. 27, 1938.

A. MARCHEVY 2,131,113

DUPLICATING APPARATUS Filed March 29, 1937' 4 Sheets-Sheet 4 Patented Sept. 27, 1938 DUPLICATIN G APPARATUS Alfred Marchev, La Grange, Ill., .assignor to Ditto, Incorporated, Chicago, Ill., acorporation of West Virginia Application March 29, 1937, Serial No. 133,577

7 Claims.

The invention relates to duplicating apparatus .and is particularly adapted to be embodied in duplicating machines of the type wherein copy sheets are moistened and are applied to a master sheet upon which the data to be copied has been written or typewritten in reverse.

A particular object of the invention is to provide a duplicating machine of the character described having improved means for assisting the operator to secure the master sheet in the machine and to replace it with another.

- One form of the invention is embodied in a duplicating machine of the kind described comprising a duplicating drum to which the master sheets may be secured detachably, a platen roller for pressing copy sheets against the master sheets, means for moistening the copy sheets as they are advanced to the duplicating drum, means for releasably clamping one edge of themaster sheet to the drum, a table or guide upon which the master sheet is placed when it is to be clamped to the drum, and a manually operable lever for opening the clamping means and for aligning the drum with the table or guide from which the master sheet is to be advanced to the clamping means.

Other objects and advantages will become apparent as the following detailed description progresses, reference being had to the accompanying drawings wherein- Fig. 1 is a side -elevation, partly broken away, of a duplicating machine which embodies the invention; 1

Fig. 2 is a fragmentary plan elevation of the improved machine;

Fig. 3 is a fragmentary section taken on line 33 of Fig. 2;

Fig. 4 is a section taken on the same line as Fig. 3, but showing certain parts in changed positions;

Fig. 5 is a fragmentary section taken on 55 of Fig. 3; and

Fig. 6 is a fragmentary section taken on line E6 of Fig. 2.

line

Referring to the drawings wherein a preferred (not shown) to a tank It'mounted in the frame I0. The tank I8 holds a supply of solvent and this solvent is pumped from the tank I8 to the reservoir I5. The pumping means 'do not form part of this invention and need not be described.

Projecting forwardly from the frame I0 is a table ZU'upon which a stack of copy sheets may be placed and advanced, manually, one .by one to the combinedfeeding and moistening rolls l3 and I4. As the copy sheets are advanced between the rolls I3 and I4, the' roll' I3'applies a.

film of solvent to the upper surface ofeaeh copy sheet. The solvent is one which will dissolve data written or typewritten upon a master sheet in reverse. A master sheet may be made by placing it against the carbon surface of a carbon sheet and typewriting or writing upon the frontside of the master sheet so that the data will appear in reverse on the back cf'the sheet. The master sheet is then secured to the drum II ,in such manner that the writing or typewriting in reverse is on the outer side as the'master sheet is trained around the drum. When the copy; sheets are advanced by the rolls I3 and I4, they pass between the duplicating drum II and'the-platen roller I2 and are pressed against theimaster sheet on the drum to obtain a copy thereof. A relatively large number of copies'of the master sheet may beobtained in this manner;

Themeans for rotating the drum ll prefer.- ably comprises a handle 22 fixed to a pin 23 rotatably .journalled in the frame Hit Comstrained to rotate with the pin 23 is'a pinion 24 which meshes with a gear 25a with which the mounted in a relatively wide and shallow slot v26 extending longitudinally of the drum II and across its entire cylindrical surface. 7 A plurality of springs, 21 disposed in bores 28 formed in the bar 25, yieldingly urge the bar 25' toward a shoulder 30 at one end of the slot 26. It will. be readily understood that the forward edge of 'a master'sheet 3| may be inserted between thebar 25' and the shoulder 30 so that the bar 25' will clamp it against the shoulder as shown in Fig. 6. A plurality of springs 33 extending-between the drum II and the bar 25 hold the bar in .placein the slot 26 but permit the bar to move edgewise to clamp the forward edges of the master sheets.

Pins 34 project from the bar 25' into the drum II which is hollow. Engageable with the pins 34 are disks 35 fixed to a shaft 36 which is journalled in the drum II and may be rotated by a pin 31 projecting from a collar 38 fixed to one end of the shaft 36. Each of the disks 35 has a flattened surface 39 in its periphery and when the flattened surfaces 39 are opposed to the pins 34 as illustrated in dotted lines in Fig. 4, the bar 25' is free to clamp the forward edge of a master sheet to the shoulder 30. However, when the shaft 36 is displaced angularly into the position wherein it is shown in Fig. 6 so that the flattened surfaces 39 are not opposed to the pins 34, the peripheries of the disks 35 acting against the pins 34 hold the bar 25' in a retracted position against the action of the springs 21.

A table 40 is provided upon which table a master sheet may be placed when its forward edge is to be clamped to the drum i l. Obviously, the shoulder 30 or rather, the slot formed between the shoulder 30 and the adjacent edgeof the bar 25 must be aligned with the table 40 if the master sheet resting thereon is to be advanced into the slot. Means is provided for bringing the drum and holding it in a position wherein the slot between the shoulder 30 and the bar 25' will be aligned with the table 40. This means preferably comprises a hand lever 42 pivoted upon a pin 43a 'welded or otherwise secured to the lever 42 and also projects inwardly toward the drum l I. Projecting from one end of the drum II is a pin 45 adapted to engage the lug 43' when the lever 42 is swung into the position wherein it is shown in full lines in Fig. 3. When the pin abuts the lug 43' as illustrated in Fig. 3, the slot between the shoulder 30 and the bar 25 is aligned with the master sheet table 40. The lug 44 is longer than the lug 43' and is adapted to engage the pin 31 when the lever 42 is in the position wherein it is shown in full lines in Fig. 3. It will be readily understood that if the lever 42 is swung into the position wherein it is shown in full lines in Fig. 3 and the drum II is being rotated in a counterclockwise direction (Fig. 3), the pin 31 will strike the lug 44 and continued rotation of the drum l I will cause the lug 44 to displace the pin 31 and the shaft 36 angularly until the disks 35 are brought from the position wherein they are shown in dotted lines in Fig. 4 to the position wherein they are shown in dotted lines in Fig. 3 so that the bar 25' will be retracted from the shoulder 30. The pin 45 is located upon the drum l I so that when the disks 35 assume the positions wherein they are illustrated in Figs. 3 and 6, the pin 45 will be in engagement with the lug 43' and the operator cannot continue to rotate the drum II in a counter-clockwise direction (Fig. 3). However, the operator may keep urging the pin 45 against the lug 43 to hold the drum ll stationary while an old master sheet is being removed therefrom and a new one is inserted.

' Any suitable means may be provided for driving the rollers 13 and 14. In this instance, the drum H has a gear 50 constrained to rotate with it and the gear 50 meshes with an idler pinion The pinion 5| meshes with a pinion 52 with which the roller [3 is constrained to rotate. The roller I4 is driven by frictional engagement with the roller [3.

The operation of the above described apparatus is substantially as follows: If it is assumed that a master sheet is on the drum I l and the desired number of copies have been made of it, it will be readily understood that the lever 42 may be swung from the position wherein it is shown in full lines in Fig. 4 to the position wherein it is shown in full lines in Fig. 3 so that when the operator continues to rotate the drum II, it will come to rest in the position wherein it is shown in Fig. 3 so that the slot between the shoulder 30 and the bar 25 will be aligned with the table 40. The bar 25' will be in its retracted position. The operator may then remove the old master sheet and place a newmaster sheet 3| on the table 40 and then employ the table as a guide to advance the master sheet until its forward edge is disposed between the shoulder 30 and the clamping bar 25'. The operator may then retract the lever 42 into the position wherein it is shown in full lines in Fig. 4 and also angularly displace the pin 31 to bring the flattened surfaces 39 into 0pposed relation with the pins 34 so that the springs 2'! will cause the clamping bar 25' to clamp the forward edge of the master sheet against the shoulder 39. Then when the operator continues to rotate the drum II in a counter-clockwise direction (Figs. '3 and 4), the master sheet is trained around the drum II. The operator may then advance copy sheets to the combined feeding and moistening rollers l3 and I4 as described above and copies may be made of the data on the master sheet.

It will be noted that the lever 42 rides in a slot 55 formed in a sheet metal housing 56 which forms part of the frame [0. The slot 55 limits angular displacement of the lever 42 in both directions.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the" construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as permissible, in view of the prior art.

' I claim:

1. In a duplicating machine of the kind described, a rotatable drum, means for securing a master sheet to said drum, means for pressing copy sheets against themaster sheet on said drum, means for guiding a master sheet to said securing means, and means for aligning said securing means with said guide means, said aligning means comprising a pivoted lever, means on said lever for engaging and opening said securing means to receive one edge of a master sheet, and means on'said lever for engaging said drum and preventing rotation thereof in the direction it is normally rotated whereby said securing means remain in alignment with said guide means.

2. In a duplicating machine of the kind described, a frame, a rotatable drum mounted in said frame, means for securing a master sheet to said drum, means for pressing copy sheets against the master sheet on said drum, means for guiding a master sheet to said securing means and means for aligning said securing means with said guiding means, said aligning means comprising a member movably mounted on said frame, means on said member for engaging and opening said clamping means, and means on said member for engaging said drum and preventing rotation thereof in'the direction it is normally rotated whereby said securing means is held in alignment with said guide means.

3. In a duplicating machine of the kind described, a frame, a rotatable drum mounted in said frame, means for securing a master sheet to said drum, means for pressing copy sheets against the master sheet on said drum, means mounted on said frame to remain stationary in a punctionally operative position for guiding a master sheet to said securing means, and means for aligning said securing means with said guide means, said aligning means comprising a lever pivoted on said frame, means on said lever for engaging said drum while it is being rotated in the normal direction and stopping it with the securing means in alignment with the guide means, and means on said lever for engaging and opening said clamping means during the final movement of said drum into the position wherein its securing means are aligned with said guide means.

4. In a duplicating machine of the kind described, a frame, a rotatable drum mounted in said frame, means for securing a master sheet to said drum, means for pressing copy sheets against the master sheet on said drum, means for guiding a master sheet to said securing means, and means for aligning said securing means with said guide means, said aligning means comprising a lever pivoted on said frame, a pin projecting from said drum, a lug on said lever engageable with said pin to stop said drum against movement in the normal direction and with its securing means in alignment with said guide means, and a second lug projecting from said lever for engaging and opening said securing means during the final movement of the drum into the position wherein its securing means are aligned with said guide means.

5. In a duplicating machine of the kind described, a frame, a rotatable drum mounted in said frame, means for clamping a master sheet to said drum, a shaft rotatably mounted in said drum, a pin projecting from said shaft, means controlled by said shaft for releasing said clamping means, yielding means for actuating said clamping means to clamp a master sheet to said drum, a table for holding a master sheet, and means for aligning said clamping means with said table, said aligning means comprising a lever pivoted on said frame, a second pin projecting and engageable with said second pin to hold said drum against rotation in the normal direction and in a position wherein its clamping means are aligned with said table, and a second lug on said lever for engaging and opening said securing means as said drum moves into the position wherein the securing means are aligned with said table.

6. In a duplicating machine of the kind described, a frame, a rotatable drum mounted in the frame, means for clamping a master sheet to said drum, means for pressing copy sheets against the master sheet on said drum, means for guiding a master sheet to said clamping means, and means for aligning said securing means with said guide means, said aligning means comprising a lever pivoted on said frame, said lever being movable manually into a position wherein it engages said drum to prevent further rotation in the normal direction and stops it with its clamping means in alignment with said guide means, said lever being provided with means for opening said clamping means during the final movement of the drum to the position wherein it is stopped with its clamping means in alignment with said guiding means.

7. In a duplicating machine of the kind described, a frame, a rotatable drum mounted in said-frame, means for securing a master sheet to said drum, means for pressing copy sheets against the master sheet on said drum, means for guiding a master sheet to said securing means, and means for aligning said securing means with said guide means, said aligning means comprising a member movably mounted on said frame,

said member being movable into a position wherein it engages said drum to prevent further rotation thereof in the normal direction and stops it with its securing means in alignment with the guide means, said member having means for engaging and opening said securing means during.-

the final movement of said drum into the position wherein it is stopped with its securing means aligned with said guide means.

ALFRED MARCHEV. 

